DO THE AFRICAN GREY'S BODY FEATHER'S GROW AGAIN? plz help?

It is called molting and he will go through molts a couple of times a year. Yes, they will grow new ones. As the new ones are ready to come in, he will pluck at the old one to get it out. Do not help him, he knows what he is doing. What you can do for him, is make sure he gets more protein during this time cause his feathers are pure protein and he will need more protein during this time. Boiled chicken is good. Also, millet is a good source of protein. He will be cranky at times while he goes through this process and he needs more rest from working so hard at removing his feathers. There is no time limit as to when they will grow in, but feeding him more protein may help the process go faster. Also, make sure you are misting him as that also helps with this process. Misting should only be 2-3 times a week. Hope this helps.